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2 marksStructure and Roles of Nucleic Acids

CAPE Biology Unit 1 · 2013 · Paper 2 · Question 2(b)(ii)

Figure 2 represents the elongation stage of translation in protein synthesis.

Using the mRNA strand below, identify the corresponding triplet bases on the tRNA molecules. Write your answer in the boxes provided. Hint: Begin at the 5′ end. mRNA 5′ UGG UUU GGC UCA 3′

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Other parts of this question

  1. 2(a)(i)State the expected ratio for the cross of the F₁ offspring.[1 mark]
  2. 2(a)(ii)State an appropriate null (H₀) hypothesis and an appropriate alternative (H₁) hypothesis for a Chi-square test of the results.[2 marks]
  3. 2(a)(iii)Complete Table 2 by calculating the missing values.[4 marks]
  4. 2(a)(iv)Determine the number of degrees of freedom. Show your calculation.[1 mark]
  5. 2(a)(v)Using the Chi-square values in Table 3, comment on the validity of the null hypothesis stated on page 5.[2 marks]
  6. 2(b)(i)What is the term used to describe EACH group of three bases on the mRNA and tRNA?[1 mark]
  7. 2(b)(iii)Outline the nucleotide sequence on the DNA strand which serves as the template for the mRNA strand in (b) (ii).[2 marks]

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